Gsm_Def.java

/*
 * Static defines.
 * Copyright (C) 1999  Christopher Edwards
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */
package javaforce.codec.gsm;

public abstract class Gsm_Def {
  // TODO: remove
  // Define the magic number for audio files

  public static final int AUDIO_FILE_MAGIC = 0x2e736e64;

  // TODO: remove
  // The encoding key for type: 8-bit ISDN u-law
  public static final int AUDIO_FILE_ENCODING_MULAW_8 = 1;

  public static final short FRAME_SIZE = 33;
  public static final short MAX_FRAME_READ = 1000;

  // TODO: use Short.MIN/MAX_VALUE
  public static final short MIN_WORD = -32768;
  public static final short MAX_WORD = 32767;

  // TODO: use Integer.MIN/MAX_VALUE
  public static final int MIN_LONGWORD = -2147483648;
  public static final int MAX_LONGWORD = 2147483647;

  /*  Table 4.1  Quantization of the Log.-Area Ratios
   */
 /* i       1      2      3        4      5      6        7       8 */
  public static final short gsm_A[]
          = {
            20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036
          };

  public static final short gsm_B[]
          = {
            0, 0, 2048, -2560, 94, -1792, -341, -1144
          };

  public static final short gsm_MIC[]
          = {
            -32, -32, -16, -16, -8, -8, -4, -4
          };

  public static final short gsm_MAC[]
          = {
            31, 31, 15, 15, 7, 7, 3, 3
          };

  /*  Table 4.2  Tabulation  of 1/A[1..8]
   */
  public static final short gsm_INVA[]
          = {
            13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708
          };

  /*   Table 4.3a  Decision level of the LTP gain quantizer
   */
 /*  bc   0         1         2          3      */
  public static final short gsm_DLB[]
          = {
            6554, 16384, 26214, 32767
          };


  /*   Table 4.3b   Quantization levels of the LTP gain quantizer
   */
 /* bc    0          1        2          3      */
  public static final short gsm_QLB[]
          = {
            3277, 11469, 21299, 32767
          };


  /*   Table 4.4   Coefficients of the weighting filter
   */
 /* i      0      1   2    3   4      5      6     7   8   9    10  */
  public static final short gsm_H[]
          = {
            -134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134
          };


  /*   Table 4.5   Normalized inverse mantissa used to compute xM/xmax
   */
 /* i      0      1      2      3      4      5     6        7  */
  public static final short gsm_NRFAC[]
          = {
            29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384
          };


  /*   Table 4.6   Normalized direct mantissa used to compute xM/xmax
   */
 /* i      0      1       2      3      4      5      6      7   */
  public static final short gsm_FAC[]
          = {
            18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767
          };
}